Tombstone - from the series 6 of the Toybiz Spiderman Animated line, I think he only wore this costume in the cartoon. I might make him in his classic suit and tie look one day.
Molten Man - this was a Toyfare magazine mail-in exclusive. Very brittle due to the "gold plastic syndrome" familiar to Transformers collectors.
Shocker - fantastic figure made by Hasbro for the Spiderman 3 line. Even better than the Toybiz versions (old 5" scale animated series) and 6" Spiderman Classics version) because of the inclusion of elbow articulation.
Jack O' Lantern - from the Toybiz Spiderman Bug Busters series, it's too bad he didn't come with his glider and bombs but he did have a great sculpt.